On Apr 24, 2012, at 2:09 PM, Allen Wirfs-Brock wrote:
> On Apr 24, 2012, at 1:40 PM, David Herman wrote:
>
>> On Apr 24, 2012, at 10:03 AM, Tab Atkins Jr. wrote:
>>
>>> There doesn't seem to be a need there for thin-arrow (dynamic this)
>>> functions.
>>>
>>> (Edit: Oh, I see, leaning on the completion value of thin-arrow
>>> functions here lets you shave a few characters off. The readability
>>> loss of mixing the two syntaxes doesn't seem worthwhile, though.)
>>
>> Lets you eliminate "{" and "}" and "return", but requires additional ":" and
>> "->". Net savings of 3 characters. But more than that, eliminating "return"
>> lets you write methods in a functional style without needing the explicit
>> control flow operator.
>>
>
> I believe that we could grammatically use ArrowBody as the body of concise
> methods in object literals and classes. In that case, Dave's example could
> be expressed as:
>
> box = {
> _value: 0,
> unbox() ()-> this._value,
ITYM:
unbox() this._value,
> setbox(v) this._value = v
> }
>
> It could also be used as the body of getter/setters
>
> val = {
> _value: 0,
> get value() this._value,
> set value(v) this._value = v
> }
This all seems reasonable to me. I guess I see a couple reasonable alternatives
here:
A. add thin arrow, add expression bodies to method shorthands
(-) Might be a bit much
(+) But all around a goodly set of convenience forms
B. add expression bodies to method shorthands, don't add skinny arrow
(-) Loses the flexibility of shorthand syntax for assigning to an existing
object, a Tab pointed out. (Sorry Axel, mustache is not particularly
Harmonious.)
(+) Keeps us to just one arrow form
C. eliminate method shorthands, add skinny arrow
(-) Loses the method shorthand in object literals
(-) Methods in classes would remain the same, which loses some symmetry
between object literals and classes
(+) Eliminates visual confusion between getters/setters and method
shorthand, but still with a minimal syntax (i.e., "->")
All three of these options look pretty decent to me. I think I'd be pretty
happy with any of them.
Dave
_______________________________________________
es-discuss mailing list
[email protected]
https://mail.mozilla.org/listinfo/es-discuss
